YOU WILL HAVE FUN, playing this fantastic FPS, that's for sure! Instant fun, from start 'till the end =)
The fact that this game is simple, doesn't mean that it's bored, in fact, if you can say something about this game, is that is REALLY fun to play.
Personally I found it rather easy, didn't had much problem to go through the game, the hard part is to make it the best you can, that's quite a challenge, but finishing the game it's easy. Another big time difficulty, is when you try to complete the game, with all the secrets and stuff, that's the real challenge of the game.
It's a game you would love to play again, try to unlock or reveal all the secrets. When you re-play the game, you'll find a bunch of new stuff to do, new difficulties, another whole new game. So that's definitely a big time plus. And if that doesn't motivate you to play it once again, you'll always want to play it, at least for a little while, because it's really fun when you start shooting everything that moves, and to know, that there will be even more targets to destroy.
One of the main characteristics of the game, is that you get the chance to kill a lot, but I mean a LOT of enemies along the way, which at least for me, it's a great thing. Enemies tend to die rather easily, but it's the numbers you'll have to start worrying about.
The graphics are great, at least for the year 2004, cinematics are great to, and equally fun to watch.
The sound it's ok, nothing exceptional, but you won't get sick of it, but you won't be looking over the Internet for the OST (original sound track) of the game.
You won't find any problems with the gameplay, but nothing new, revolutionary or extremely cool. You will find a great FPS (first person shooter) all the way through the game.
Hope you enjoy... 'cause I know I did :)